Submission #396642

#	Time	Username	Problem	Language	Result	Execution time	Memory
396642		timmyfeng	Foehn Phenomena (JOI17_foehn_phenomena)	C++17	100 / 100	149 ms	6772 KiB

foehn_phenomena

#include <bits/stdc++.h>
using namespace std;

const int N = 200001;

long long diff[N];

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);

    int n, q, s, t;
    cin >> n >> q >> s >> t;

    for (int i = 0; i <= n; ++i) {
        cin >> diff[i];
    }

    adjacent_difference(diff, diff + n + 1, diff);

    long long wind = 0;
    for (int i = 0; i <= n; ++i) {
        wind -= (diff[i] < 0 ? t : s) * diff[i];
    }

    while (q--) {
        int l, r, x;
        cin >> l >> r >> x;

        wind += (diff[l] < 0 ? t : s) * diff[l];
        diff[l] += x;
        wind -= (diff[l] < 0 ? t : s) * diff[l];

        if (r < n) {
            wind += (diff[r + 1] < 0 ? t : s) * diff[r + 1];
            diff[r + 1] -= x;
            wind -= (diff[r + 1] < 0 ? t : s) * diff[r + 1];
        }

        cout << wind << "\n";
    }
}

• Subtask 1: 30 / 30
• Subtask 2: 10 / 10
• Subtask 3: 60 / 60